Age Group
Subjects (30)
Mean Chronologic Age ± SD
Mean Estimated Age by Indian Formula ± SD
Mean Estimated Age by Demirjian Formula ± SD
Difference in Estimated Age and Chronological Age by Indian Formula
Difference in Estimated Age and Chronological Age by Demirjian Formula
10.1–15
10
13.20±0.815
14.31±1.25
12.66±0.692
1.10±1.106
–0.55±0.672
15.1–20
18
17.12±0.527
17.56±1.41
14.54±0.836
0.44±0.987
–2.58±0.987
20.1–25
1
20.25
19.07
15.26
–1.18
–4.99
25.1–30
1
26.17
19.44
16.33
–6.73
–9.84
P value
<0.0001
<0.0001
<0.0001
<0.0001
Table 2:
Comparison between chronological age and estimated age derived by Indian formula and Demirjian's formula in the orthodontic group.
